Trolls on your blog or videos?

I have done plenty of video reviews over the years and posted them all on my YouTube channel. Since that time I have had plenty of Trolls on my site and ect. leaving all kinds of stupid and ignorant comments.
What do you do to resolve the problem. I have blocked and deleted everything, but it seems to just make it worse. Any advice?

I think that's about all you can do. I get tons of spam on my site so I just put up a spam filter rather than go through and delete things. I'm not on YouTube and I'm not sure if there's a way to filter like that there.

YouTube is a unique site. You have this wonderful collection of every kind of video you can imagine and it's a place you could waste all day on. But right below those videos are the comments and "You will never find a more wretched hive of scum and villainy" and trolls.
I think the only thing you can do is turn off comments and then have a link which would lead the viewer to a blog where you'd have much more control over commenting.
That does sound a bit convoluted, doesn't it?